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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
I tried to find where in the kata is the issue you are trying to mark here, but failed. Every mention of (2^200) ^ (2^300) results in 6 as the last digit. Can you please clarify what needs to be corrected? Or if there is no mistake anywhere in the kata, please check this issue as resolved.
Update: Okay, I think I found and corrected it (it was in Python-specific examples). Please mark this as resolved if satisfied.